CVE-2019-5747
CVSS v3
7.5
HIGH
EPSS Score
4.7 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
An issue was discovered in BusyBox through 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP client, server, and/or relay) might allow a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to assurance of a 4-byte length when decoding DHCP_SUBNET. NOTE: this issue exists because of an incomplete fix for CVE-2018-20679.
Technical details
- Published
- 2019-01-09
Frequently asked questions
What is CVE-2019-5747?
An issue was discovered in BusyBox through 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP client, server, and/or relay) might allow a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to assurance of a 4-byte length when decoding DHCP_SUBNET. NOTE: this issue exists because of an incomplete fix for CVE-2018-20679.
Is CVE-2019-5747 actively exploited?
Active exploitation of CVE-2019-5747 has not been confirmed. Its EPSS score was 4.7% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2019-5747?
CVE-2019-5747 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2019-5747 affecting your environment?
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